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/*
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assert(CW6c.get_prices(List("BIDU"), 2004 to 2008) == List(List(None), List(None),
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List(Some(6.35)), List(Some(12.241)),
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List(Some(38.188))))
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*/
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assert(CW6c.get_prices(List("GOOG", "AAPL"), 2010 to 2012) ==
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List(List(Some(311.349976), Some(27.505054)),
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List(Some(300.222351), Some(42.357094)),
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List(Some(330.555054), Some(52.852215))))
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